1 code implementation • 4 Dec 2023 • Nicholas Dwork, Erin K. Englund
Compressed sensing allows one to reconstruct a high-quality image with fewer samples which can be collected with a faster scan.
no code implementations • 18 Jan 2023 • Alex McManus, Stephen Becker, Nicholas Dwork
Parallel imaging with linear predictability takes advantage of information present in multiple receive coils to accurately reconstruct the image with fewer samples.
no code implementations • 11 Jun 2022 • Abhejit Rajagopal, Andrew P. Leynes, Nicholas Dwork, Jessica E. Scholey, Thomas A. Hope, Peder E. Z. Larson
In this paper, we review physics- and data-driven reconstruction techniques for simultaneous positron emission tomography (PET) / magnetic resonance imaging (MRI) systems, which have significant advantages for clinical imaging of cancer, neurological disorders, and heart disease.
no code implementations • 24 Jul 2021 • Nicholas Dwork, Peder E. Z. Larson
The curvelet representation is approximately sparse; thus, it is a useful sparsifying transformation to be used with compressed sensing.
no code implementations • 12 Jun 2021 • Nicholas Dwork, Daniel O'Connor, Ethan M. I. Johnson, Corey A. Baron, Jeremy W. Gordon, John M. Pauly, Peder E. Z. Larson
The Gridding algorithm has shown great utility for reconstructing images from non-uniformly spaced samples in the Fourier domain in several imaging modalities.
no code implementations • 1 Jul 2020 • Nicholas Dwork, Ethan M. I. Johnson, Daniel O'Connor, Jeremy W. Gordon, Adam B. Kerr, Corey A. Baron, John M. Pauly, Peder E. Z. Larson
In this manuscript, we present a generalization of several existing iterative model based algorithms.
no code implementations • 14 Apr 2020 • Nicholas Dwork, Corey A. Baron, Ethan M. I. Johnson, Daniel O'Connor, John M. Pauly, Peder E. Z. Larson
We present a fast method for generating random samples according to a variable density Poisson-disc distribution.
no code implementations • 11 Mar 2020 • Nicholas Dwork, Jeremy W. Gordon, Shuyu Tang, Daniel O'Connor, Esben Sovso Szocska Hansen, Christoffer Laustsen, Peder E. Z. Larson
Magnetic resonance imaging with hyperpolarized contrast agents can provide unprecedented \textit{in-vivo} measurements of metabolism, but yields images that are lower resolution than that achieved with proton anatomical imaging.
no code implementations • 11 Feb 2020 • Nicholas Dwork, Daniel O'Connor, Corey A. Baron, Ethan M. I. Johnson, Adam B. Kerr, John M. Pauly, Peder E. Z. Larson
In this work, we take advantage of the structure of this wavelet transform and identify an affine transformation that increases the sparsity of the result.